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To copy your Thunderbird setup, emails, address books, and preferences to a new computer, you need to transfer your complete Thunderbird profile folder.

1. Close Thunderbird and Locate the Folder on Your Old Computer: Old PC.

Ensure Thunderbird is completely closed. On Windows, press Windows Key + R, type %appdata%, and press Enter. Find the folder named Thunderbird. (If you are on a Mac, look in ~/Library/Thunderbird/).

• Verification: Confirm that you see the Thunderbird folder containing a Profiles subfolder.

1. Copy the Folder to an External Drive: USB Drive.

Copy the entire Thunderbird folder onto a USB flash drive or external hard drive.

• Verification: Check that the folder copied successfully and sits completely on your external drive.

1. Install and Initialize Thunderbird on Your New Computer: New PC.

Download and install Thunderbird on your new computer. Open it once, and then close it immediately. Do not set up or configure any email accounts when prompted.

• Verification: Ensure Thunderbird is fully closed and not running in your system tray or background processes.

1. Replace the Profile Folder on Your New Computer: New PC.

On the new computer, open the AppData directory by pressing Windows Key + R, typing %appdata%, and pressing Enter. Delete or rename the default Thunderbird folder there, then paste the Thunderbird folder from your USB drive into this location (overwrite or replace existing files if prompted).

• Verification: Open Thunderbird; your previous email accounts, custom folders, messages, and settings will load automatically.

Are you moving between the same operating systems (such as Windows to Windows), or are you switching between different platforms like Windows and Mac?

From: https://support.mozilla.org/en-US/questions/1193450

The emails that I send with Thunderbird are clean and very professional when I send them. When my clients respond, their emails are also very clean and professional. However, the string of emails includes “�” after my sentences. These unusual characters also magically appear at the end of sentences in other individuals' emails in the earlier string of emails.

My clients tell me that the characters “�” appear in the email that they receive from me. I would like to know how to eliminate the unwanted addition of these characters.

You took me to a good place. I tried a variety of options and found that when I checked the checkbox 'When possible use the default text encoding in replies,' the problem went away. Thanks for getting me to the right place.